KNOXVILLE — A note detailing a bomb threat at Knoxville High School forced cancellation of classes and closure of the entire District 202 late Monday morning.

Officials say investigators and police dogs searched the high school, and no bomb was found. The note containing the threat was discovered by a teacher just after 10 a.m. in a hallway of the high school.

District 202 Superintendent Steve Wilder said no student has yet been linked to the threat.

The high school was placed on lockdown and students were evacuated from the high school to the junior high school. Authorities say the note did not target any other locations in the district, and Wilder called the decision to close all district schools "purely a precaution."